397868794 has 4 divisors (see below), whose sum is σ = 596803194. Its totient is φ = 198934396.

The previous prime is 397868791. The next prime is 397868813. The reversal of 397868794 is 497868793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 497868793 = 1973 ⋅252341.

It can be written as a sum of positive squares in only one way, i.e., 269386569 + 128482225 = 16413^2 + 11335^2 .

It is not an unprimeable number, because it can be changed into a prime (397868791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99467197 + ... + 99467200.

Almost surely, 2^397868794 is an apocalyptic number.

397868794 is a deficient number, since it is larger than the sum of its proper divisors (198934400).

397868794 is a wasteful number, since it uses less digits than its factorization.

397868794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198934399.

The product of its digits is 18289152, while the sum is 61.

The square root of 397868794 is about 19946.6486909456. The cubic root of 397868794 is about 735.4953971222.

Subtracting 397868794 from its reverse (497868793), we obtain a palindrome (99999999).

The spelling of 397868794 in words is "three hundred ninety-seven million, eight hundred sixty-eight thousand, seven hundred ninety-four".